/**
* LightBox Gone Wild.
*
* Inspired by the lightbox implementation found at http://www.huddletogether.com/projects/lightbox/
*
* Required files should be linked in Html-object:
*  $html->setCss( 'link', API_URL.'js/lightbox2/lightbox2.css', TRUE );
*  $html->setJs( 'link', API_URL.'js/lightbox2/lightbox2.js', TRUE );
*
* Example of content for LightBox window:
* <samp>
* <? if ( isset( $_SERVER['HTTP_X_REQUESTED_WITH'] ) && $_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest' ) { ?>
* <div class="lbHeader">
*	 <h1><?=$DOC_TITLE?></h1>
*	 <div class="lbClose"><a href="#" class="lbAction" rel="deactivate"><?=L('close')?></a></div>
* </div>
* <div class="lbBody">
* </div>
* <? } ?>
* </samp>
*
* @author Chris Campbell (2/1/2006)
* @link http://particletree.com/features/lightbox-gone-wild/
*
* @author Pavel Jartsev <papi@digitalfruit.ee>
* @package Api
* @subpackage JavaScript
*/

/*-------------------------------GLOBAL VARIABLES------------------------------------*/

var detect = navigator.userAgent.toLowerCase();
var OS,browser,version,total,thestring;

// URL of lightbox content which should be opened by default
// (i.e. when window.onload occurs)
var lbOpenURL = null;
var openedLightbox;
/*-----------------------------------------------------------------------------------------------*/

//Browser detect script origionally created by Peter Paul Koch at http://www.quirksmode.org/

function getBrowserInfo() {
	if (checkIt('konqueror')) {
		browser = "Konqueror";
		OS = "Linux";
	}
	else if (checkIt('safari')) browser 	= "Safari"
	else if (checkIt('omniweb')) browser 	= "OmniWeb"
	else if (checkIt('opera')) browser 		= "Opera"
	else if (checkIt('webtv')) browser 		= "WebTV";
	else if (checkIt('icab')) browser 		= "iCab"
	else if (checkIt('msie')) browser 		= "Internet Explorer"
	else if (!checkIt('compatible')) {
		browser = "Netscape Navigator"
		version = detect.charAt(8);
	}
	else browser = "An unknown browser";

	if (!version) version = detect.charAt(place + thestring.length);

	if (!OS) {
		if (checkIt('linux')) OS 		= "Linux";
		else if (checkIt('x11')) OS 	= "Unix";
		else if (checkIt('mac')) OS 	= "Mac"
		else if (checkIt('win')) OS 	= "Windows"
		else OS 								= "an unknown operating system";
	}
}

function checkIt(string) {
	place = detect.indexOf(string) + 1;
	thestring = string;
	return place;
}

/*-----------------------------------------------------------------------------------------------*/

Event.observe(window, 'load', initialize, false);
Event.observe(window, 'load', getBrowserInfo, false);
Event.observe(window, 'unload', Event.unloadCache, false);

var lightbox = Class.create();

lightbox.prototype = {

	yPos : 0,
	xPos : 0,

	initialize: function(ctrl) {
		if ( ctrl != null ) {
			this.content = ctrl.href;
			Event.observe(ctrl, 'click', this.activate.bindAsEventListener(this), false);
			ctrl.onclick = function(){return false;};
		}
	},

	// Turn everything on - mainly the IE fixes
	activate: function(){
		if (browser == 'Internet Explorer'){
			this.getScroll();
			this.prepareIE('100%', 'hidden');
			this.setScroll(0,0);
			this.hideSelects('hidden');
		}
		this.displayLightbox("block");
		
	},

	// Ie requires height to 100% and overflow hidden or else you can scroll down past the lightbox
	prepareIE: function(height, overflow){
		var bod = document.getElementsByTagName('body')[0];
		bod.style.height = height;
		bod.style.overflow = overflow;

		var htm = document.getElementsByTagName('html')[0];
		htm.style.height = height;
		htm.style.overflow = overflow;
	},

	// In IE, select elements hover on top of the lightbox
	hideSelects: function(visibility){
		var selects = document.getElementsByTagName('select');
		for(i = 0; i < selects.length; i++) {
			selects[i].style.visibility = visibility;
		}
	},

	// Taken from lightbox implementation found at http://www.huddletogether.com/projects/lightbox/
	getScroll: function(){
		if (self.pageYOffset) {
			this.yPos = self.pageYOffset;
		} else if (document.documentElement && document.documentElement.scrollTop){
			this.yPos = document.documentElement.scrollTop;
		} else if (document.body) {
			this.yPos = document.body.scrollTop;
		}
	},

	setScroll: function(x, y){
		window.scrollTo(x, y);
	},

	displayLightbox: function(display){
		$('overlay2').style.display = display;
		$('lightbox2').style.display = display;
		$('lightbox2').style.top = ((($('overlay2').offsetHeight - $('lightbox2').offsetHeight) / 2)-100)+"px";
		$('lightbox2').style.left = (($('overlay2').offsetWidth - $('lightbox2').offsetWidth) / 2)+"px";
		if(display != 'none') this.loadInfo();
	},

	// Begin Ajax request based off of the href of the clicked linked
	loadInfo: function() {
		openedLightbox = this;
		var myAjax = new Ajax.Request(
        this.content,
        {method: 'post', parameters: "", onComplete: this.processInfo.bindAsEventListener(this)}
		);

	},

	// Display Ajax response
	processInfo: function(response){
		if($("lbContent")) $("lbContent").remove();
		var info = "<div id='lbContent'>" + response.responseText + "</div>";
		new Insertion.Before($('lbLoadMessage'), info)
		$('lightbox2').className = "done";
		this.actions();
	},

	// Search through new links within the lightbox, and attach click event
	actions: function(){
		var lbActions = document.getElementsByClassName('lbAction');

		for(i = 0; i < lbActions.length; i++) {
			Event.observe(lbActions[i], 'click', this[lbActions[i].rel].bindAsEventListener(this), false);
			lbActions[i].onclick = function(){return false;};
		}

	},

	// Example of creating your own functionality once lightbox is initiated
	insert: function(e){
		var link = Event.element(e);
		if ( ! link.href )
			link = link.parentNode;

		if ( link.href ) {
			Element.remove('lbContent');

			var myAjax = new Ajax.Request(
				link.href,
				{method: 'post', parameters: "", onComplete: this.processInfo.bindAsEventListener(this)}
			);
		}
	},

	// Example of creating your own functionality once lightbox is initiated
	deactivate: function(){
		Element.hide('lbContent');
		Element.remove('lbContent');

		if (browser == "Internet Explorer"){
			this.setScroll(0,this.yPos);
			this.prepareIE("auto", "auto");
			this.hideSelects("visible");
		}
		
		$("lightbox2").style.opacity="0.0";
		$('lightbox2').style.filter="alpha(opacity=0)";
		this.displayLightbox("none");
	}
}

/*-----------------------------------------------------------------------------------------------*/

// Onload, make all links that need to trigger a lightbox active
function initialize(){
	addLightboxMarkup();
	var lbox = document.getElementsByClassName('lbOn');
	for(i = 0; i < lbox.length; i++) {
		var valid = new lightbox(lbox[i]);
	}

	// open given URL by default
	if ( lbOpenURL ) {
		var lb = new lightbox( null );
		lb.content = lbOpenURL;
		lb.activate();
	}
}

// Add in markup necessary to make this work. Basically two divs:
// Overlay holds the shadow
// Lightbox is the centered square that the content is put into.
function addLightboxMarkup() {
	var bod 				= document.getElementsByTagName('body')[0];
	var overlay 			= document.createElement('div');
	overlay.id		= 'overlay2';
	var lb					= document.createElement('div');
	lb.id				= 'lightbox2';
	lb.className 	= 'loading';
	lb.innerHTML	= '<div id="lbLoadMessage">' +
//						  '<p>Loading</p>' +
						  '</div>';
	bod.appendChild(overlay);
	bod.appendChild(lb);
}